I saw a post on the forums recently where a person didn't understand why the images they imported into their eLearning project were not showing up, were slow to load, or were showing up as red boxes. My experience is that the images being selected were too large for the elearning course. This video is my workflow for optimising and importing stock photography into my eLearning project, so they take up as little space as possible and still look good.
Do This to Your Images Before Adding to Your Captivate eLearning